By factory settings, I am assuming you are reffering to the Operating System, or Windows XP. If this is not a correct assumption, please let me know.
Unfortunately, there is no way to reset the PC to a factory default configuration with out the discs provided by the manufacturer. Those discs not only contain the operating system install files, but also any drivers that are used that are specific to models made by that manufacturer.
Newer PCs skip the need of discs by creating a "Recovery Partition" on your hardrive. Think of this as a snapshot taken of your PC just as it leaves the manufacturer. It is possibly to boot to this partition, erase you current configuration, and restore this "factory default" configuration. Unfortunately, this option is not available on your specific PC model.
It is possible to re-install the Windows operating system by using any type of Windows install media (CD,DVD,etc), but you will also have to download any special drivers (video card, sounds card, printer) from the manufacturer's web site.
Umax 2200 usb scanner & Vistascan 3.55u in Windows XP Scanner installs to the default XP...
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Umax 2200 usb scanner & Vistascan 3.55u in Windows XP Scanner installs to the default XP scanning software, but I have not been able to install the scanner so that it works with the Vistascan software. I much prefer Vistascan as it is much more user friendly & offers more flexibility. Any help would be appreciated.